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.dsy:it. : Powered by vBulletin version 2.3.1 .dsy:it. > Didattica > Corsi G - M > Matematica del continuo > [com dig] Disequazioni: esercizi ! ! !
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sHioUx
.primate.

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 Disequazioni: esercizi!!!

Ciao ,

mi servirebbe la soluzione di questa disequazione:

sqrt(e^x - 2e^x) <= e^x + 1

sqrt = radice quadrata
e^x = e elevato alla x

io ottengo un risultato impossibile...qualcuno l'ha già fatta??Quanto viene?? (l'avevamo fatta in classe)...

ciaux:schoked:

Last edited by Lunik on 04-05-2003 at 10:46
04-05-2003 10:10
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Elex
la zia perfetta

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http://www.dsy.it/forum/showthread....62238#post62238
questo è il topic per problemi con istituzioni
04-05-2003 10:13
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Lunik
dsy core staff

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Off-Topic:
lasciamo questo topic...separiamo limiti e disequazioni!

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04-05-2003 10:45
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Barone
non cambio mai avatar

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credo che sia impossibile poichè qls x tu sostituisca a "e^x" il radicando viene sempre negativo...Infatti:
e^x-2e^x=e^x(1-2)=-e^x
-e^x è sempre negativo...quindi è impossibile...

Almeno credo...
04-05-2003 11:07
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sHioUx
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Originally posted by Barone
credo che sia impossibile poichè qls x tu sostituisca a "e^x" il radicando viene sempre negativo...Infatti:
e^x-2e^x=e^x(1-2)=-e^x
-e^x è sempre negativo...quindi è impossibile...

Almeno credo...


grazie, speriamo in bene!
ciao!
04-05-2003 11:13
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Barone
non cambio mai avatar

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preciso che non ho qst esercizio sul quaderno..l'ho fatto al momento.
04-05-2003 11:20
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sHioUx
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Originally posted by Barone
preciso che non ho qst esercizio sul quaderno..l'ho fatto al momento.

ok no problem
04-05-2003 12:20
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rider
.grande:maestro.

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Ciao...
ho provato a fare questa disequazione e' giusta??

logbase2 di (x^2 + 1 )>= 3
Risultato: x<= -(sqrt32)/2 e x>= (sqrt32)/2

E' corretta ????
04-05-2003 17:32
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